<th:block layout:decorator="layout/fullPageLayout">
    <div layout:fragment="content">
        <div th:class="default_error_message">
            <h2>
                <span th:utext="#{unhandled_exception_message}"/> : <span th:utext="${exceptionUUID}"/>
            </h2>
        </div>
    </div>
</th:block>